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<li class="chapter" data-level="" data-path="abstract.html"><a href="abstract.html"><i class="fa fa-check"></i>内容概要</a></li>
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<li class="chapter" data-level="1" data-path="data-read-write-description.html"><a href="data-read-write-description.html"><i class="fa fa-check"></i><b>1</b> 数据导入导出</a>
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<li class="chapter" data-level="1.1.3" data-path="readxl-description.html"><a href="readxl-description.html#batch:read"><i class="fa fa-check"></i><b>1.1.3</b> 批量读取</a></li>
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<li class="chapter" data-level="1.2" data-path="writexl.html"><a href="writexl.html"><i class="fa fa-check"></i><b>1.2</b> writexl</a>
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<li class="chapter" data-level="1.2.1" data-path="writexl.html"><a href="writexl.html#writexl:usage"><i class="fa fa-check"></i><b>1.2.1</b> 用法</a></li>
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<li class="chapter" data-level="1.3" data-path="openxlsx-description.html"><a href="openxlsx-description.html"><i class="fa fa-check"></i><b>1.3</b> openxlsx</a>
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<li class="chapter" data-level="1.3.1" data-path="openxlsx-description.html"><a href="openxlsx-description.html#openxlsx:install"><i class="fa fa-check"></i><b>1.3.1</b> 安装</a></li>
<li class="chapter" data-level="1.3.2" data-path="openxlsx-description.html"><a href="openxlsx-description.html#openxlsx:functions"><i class="fa fa-check"></i><b>1.3.2</b> 基础功能</a></li>
<li class="chapter" data-level="1.3.3" data-path="openxlsx-description.html"><a href="openxlsx-description.html#定制格式输出"><i class="fa fa-check"></i><b>1.3.3</b> 定制格式输出</a></li>
<li class="chapter" data-level="1.3.4" data-path="openxlsx-description.html"><a href="openxlsx-description.html#函数参数"><i class="fa fa-check"></i><b>1.3.4</b> 函数参数</a></li>
<li class="chapter" data-level="1.3.5" data-path="openxlsx-description.html"><a href="openxlsx-description.html#总结"><i class="fa fa-check"></i><b>1.3.5</b> 总结</a></li>
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<li class="chapter" data-level="1.4" data-path="readr-package.html"><a href="readr-package.html"><i class="fa fa-check"></i><b>1.4</b> readr</a>
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<li class="chapter" data-level="1.4.1" data-path="readr-package.html"><a href="readr-package.html#readr:install"><i class="fa fa-check"></i><b>1.4.1</b> 安装</a></li>
<li class="chapter" data-level="1.4.2" data-path="readr-package.html"><a href="readr-package.html#readr:usage"><i class="fa fa-check"></i><b>1.4.2</b> 用法</a></li>
<li class="chapter" data-level="1.4.3" data-path="readr-package.html"><a href="readr-package.html#readr:write-function"><i class="fa fa-check"></i><b>1.4.3</b> 导出功能</a></li>
<li class="chapter" data-level="1.4.4" data-path="readr-package.html"><a href="readr-package.html#总结-1"><i class="fa fa-check"></i><b>1.4.4</b> 总结</a></li>
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<li class="chapter" data-level="1.5" data-path="data-vroom.html"><a href="data-vroom.html"><i class="fa fa-check"></i><b>1.5</b> vroom</a>
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<li class="chapter" data-level="1.5.1" data-path="data-vroom.html"><a href="data-vroom.html#安装"><i class="fa fa-check"></i><b>1.5.1</b> 安装</a></li>
<li class="chapter" data-level="1.5.2" data-path="data-vroom.html"><a href="data-vroom.html#用法"><i class="fa fa-check"></i><b>1.5.2</b> 用法</a></li>
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<li class="chapter" data-level="1.6" data-path="data-rstudio-addins.html"><a href="data-rstudio-addins.html"><i class="fa fa-check"></i><b>1.6</b> Rstudio导入</a>
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<li class="chapter" data-level="1.6.1" data-path="data-rstudio-addins.html"><a href="data-rstudio-addins.html#rstudio-工具栏导入"><i class="fa fa-check"></i><b>1.6.1</b> rstudio 工具栏导入</a></li>
<li class="chapter" data-level="1.6.2" data-path="data-rstudio-addins.html"><a href="data-rstudio-addins.html#插件导入"><i class="fa fa-check"></i><b>1.6.2</b> 插件导入</a></li>
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<li class="chapter" data-level="1.7" data-path="data-file-path.html"><a href="data-file-path.html"><i class="fa fa-check"></i><b>1.7</b> 文件路径</a>
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<li class="chapter" data-level="1.7.1" data-path="data-file-path.html"><a href="data-file-path.html#指定路径"><i class="fa fa-check"></i><b>1.7.1</b> 指定路径</a></li>
<li class="chapter" data-level="1.7.2" data-path="data-file-path.html"><a href="data-file-path.html#默认路径"><i class="fa fa-check"></i><b>1.7.2</b> 默认路径</a></li>
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<li class="chapter" data-level="1.8" data-path="data-expand.html"><a href="data-expand.html"><i class="fa fa-check"></i><b>1.8</b> 拓展</a>
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<li class="chapter" data-level="1.8.1" data-path="data-expand.html"><a href="data-expand.html#tidyxl:package"><i class="fa fa-check"></i><b>1.8.1</b> tidyxl</a></li>
<li class="chapter" data-level="1.8.2" data-path="data-expand.html"><a href="data-expand.html#参考资料"><i class="fa fa-check"></i><b>1.8.2</b> 参考资料</a></li>
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<li class="chapter" data-level="2" data-path="Data-Manipulation-dplyr.html"><a href="Data-Manipulation-dplyr.html"><i class="fa fa-check"></i><b>2</b> 数据处理之-dplyr</a>
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<li class="chapter" data-level="2.1" data-path="dplyr-description.html"><a href="dplyr-description.html"><i class="fa fa-check"></i><b>2.1</b> 前言</a>
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<li class="chapter" data-level="2.1.1" data-path="dplyr-description.html"><a href="dplyr-description.html#dplyr:install-package"><i class="fa fa-check"></i><b>2.1.1</b> 安装</a></li>
<li class="chapter" data-level="2.1.2" data-path="dplyr-description.html"><a href="dplyr-description.html#dplyr:difference-of-sql"><i class="fa fa-check"></i><b>2.1.2</b> Excel and Sql 类比</a></li>
<li class="chapter" data-level="2.1.3" data-path="dplyr-description.html"><a href="dplyr-description.html#常见问题"><i class="fa fa-check"></i><b>2.1.3</b> 常见问题</a></li>
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<li class="chapter" data-level="2.2" data-path="dplyr-usage.html"><a href="dplyr-usage.html"><i class="fa fa-check"></i><b>2.2</b> 基础用法</a>
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<li class="chapter" data-level="2.2.1" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-filter"><i class="fa fa-check"></i><b>2.2.1</b> filter</a></li>
<li class="chapter" data-level="2.2.2" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-select"><i class="fa fa-check"></i><b>2.2.2</b> select</a></li>
<li class="chapter" data-level="2.2.3" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-rename"><i class="fa fa-check"></i><b>2.2.3</b> rename</a></li>
<li class="chapter" data-level="2.2.4" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-relocate"><i class="fa fa-check"></i><b>2.2.4</b> relocate</a></li>
<li class="chapter" data-level="2.2.5" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-mutate"><i class="fa fa-check"></i><b>2.2.5</b> mutate</a></li>
<li class="chapter" data-level="2.2.6" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-arrange"><i class="fa fa-check"></i><b>2.2.6</b> arrange</a></li>
<li class="chapter" data-level="2.2.7" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-summarise"><i class="fa fa-check"></i><b>2.2.7</b> summarise</a></li>
<li class="chapter" data-level="2.2.8" data-path="dplyr-usage.html"><a href="dplyr-usage.html#dplyr-groupby"><i class="fa fa-check"></i><b>2.2.8</b> group_by</a></li>
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<li class="chapter" data-level="2.3" data-path="dplyr-functions.html"><a href="dplyr-functions.html"><i class="fa fa-check"></i><b>2.3</b> 常用函数</a>
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<li class="chapter" data-level="2.3.1" data-path="dplyr-functions.html"><a href="dplyr-functions.html#条件判断"><i class="fa fa-check"></i><b>2.3.1</b> 条件判断</a></li>
<li class="chapter" data-level="2.3.2" data-path="dplyr-functions.html"><a href="dplyr-functions.html#case_when"><i class="fa fa-check"></i><b>2.3.2</b> case_when</a></li>
<li class="chapter" data-level="2.3.3" data-path="dplyr-functions.html"><a href="dplyr-functions.html#计数函数"><i class="fa fa-check"></i><b>2.3.3</b> 计数函数</a></li>
<li class="chapter" data-level="2.3.4" data-path="dplyr-functions.html"><a href="dplyr-functions.html#排序函数"><i class="fa fa-check"></i><b>2.3.4</b> 排序函数</a></li>
<li class="chapter" data-level="2.3.5" data-path="dplyr-functions.html"><a href="dplyr-functions.html#提取向量"><i class="fa fa-check"></i><b>2.3.5</b> 提取向量</a></li>
<li class="chapter" data-level="2.3.6" data-path="dplyr-functions.html"><a href="dplyr-functions.html#dplyr:slice"><i class="fa fa-check"></i><b>2.3.6</b> slice 系列</a></li>
<li class="chapter" data-level="2.3.7" data-path="dplyr-functions.html"><a href="dplyr-functions.html#group-系列"><i class="fa fa-check"></i><b>2.3.7</b> group 系列</a></li>
<li class="chapter" data-level="2.3.8" data-path="dplyr-functions.html"><a href="dplyr-functions.html#其它函数"><i class="fa fa-check"></i><b>2.3.8</b> 其它函数</a></li>
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<li class="chapter" data-level="2.4" data-path="dplyr-merge-two-table.html"><a href="dplyr-merge-two-table.html"><i class="fa fa-check"></i><b>2.4</b> 表关联</a>
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<li class="chapter" data-level="2.4.1" data-path="dplyr-merge-two-table.html"><a href="dplyr-merge-two-table.html#dplyr:merge-table-usage"><i class="fa fa-check"></i><b>2.4.1</b> 两表关联</a></li>
<li class="chapter" data-level="2.4.2" data-path="dplyr-merge-two-table.html"><a href="dplyr-merge-two-table.html#dplyr:merge-multiple-table"><i class="fa fa-check"></i><b>2.4.2</b> 多表操作</a></li>
</ul></li>
<li class="chapter" data-level="2.5" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html"><i class="fa fa-check"></i><b>2.5</b> 分组操作</a>
<ul>
<li class="chapter" data-level="2.5.1" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#添加分组"><i class="fa fa-check"></i><b>2.5.1</b> 添加分组</a></li>
<li class="chapter" data-level="2.5.2" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#查看分组"><i class="fa fa-check"></i><b>2.5.2</b> 查看分组</a></li>
<li class="chapter" data-level="2.5.3" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#更改和添加分组变量"><i class="fa fa-check"></i><b>2.5.3</b> 更改和添加分组变量</a></li>
<li class="chapter" data-level="2.5.4" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#删除分组变量"><i class="fa fa-check"></i><b>2.5.4</b> 删除分组变量</a></li>
<li class="chapter" data-level="2.5.5" data-path="dplyr-groupby-manipulation.html"><a href="dplyr-groupby-manipulation.html#动词影响"><i class="fa fa-check"></i><b>2.5.5</b> 动词影响</a></li>
</ul></li>
<li class="chapter" data-level="2.6" data-path="dplyr-column-manipulation.html"><a href="dplyr-column-manipulation.html"><i class="fa fa-check"></i><b>2.6</b> 列操作</a>
<ul>
<li class="chapter" data-level="2.6.1" data-path="dplyr-column-manipulation.html"><a href="dplyr-column-manipulation.html#dplyr-column-manipulation-basic-usage"><i class="fa fa-check"></i><b>2.6.1</b> 基础用法</a></li>
<li class="chapter" data-level="2.6.2" data-path="dplyr-column-manipulation.html"><a href="dplyr-column-manipulation.html#多种函数功能"><i class="fa fa-check"></i><b>2.6.2</b> 多种函数功能</a></li>
<li class="chapter" data-level="2.6.3" data-path="dplyr-column-manipulation.html"><a href="dplyr-column-manipulation.html#当前列"><i class="fa fa-check"></i><b>2.6.3</b> 当前列</a></li>
</ul></li>
<li class="chapter" data-level="2.7" data-path="dplyr-row-manipulation.html"><a href="dplyr-row-manipulation.html"><i class="fa fa-check"></i><b>2.7</b> 行操作</a>
<ul>
<li class="chapter" data-level="2.7.1" data-path="dplyr-row-manipulation.html"><a href="dplyr-row-manipulation.html#比较差异"><i class="fa fa-check"></i><b>2.7.1</b> 比较差异</a></li>
<li class="chapter" data-level="2.7.2" data-path="dplyr-row-manipulation.html"><a href="dplyr-row-manipulation.html#常用案例"><i class="fa fa-check"></i><b>2.7.2</b> 常用案例</a></li>
</ul></li>
<li class="chapter" data-level="2.8" data-path="dplyr-programming.html"><a href="dplyr-programming.html"><i class="fa fa-check"></i><b>2.8</b> <code>dplyr</code>编程</a>
<ul>
<li class="chapter" data-level="2.8.1" data-path="dplyr-programming.html"><a href="dplyr-programming.html#案例"><i class="fa fa-check"></i><b>2.8.1</b> 案例</a></li>
</ul></li>
<li class="chapter" data-level="2.9" data-path="dplyr-reference-material.html"><a href="dplyr-reference-material.html"><i class="fa fa-check"></i><b>2.9</b> 参考资料</a></li>
</ul></li>
<li class="chapter" data-level="3" data-path="Data-tidyr-package.html"><a href="Data-tidyr-package.html"><i class="fa fa-check"></i><b>3</b> 整洁数据之 tidyr</a>
<ul>
<li class="chapter" data-level="3.1" data-path="tidyr-useage.html"><a href="tidyr-useage.html"><i class="fa fa-check"></i><b>3.1</b> tidyr 介绍</a>
<ul>
<li class="chapter" data-level="3.1.1" data-path="tidyr-useage.html"><a href="tidyr-useage.html#tidyr:install"><i class="fa fa-check"></i><b>3.1.1</b> 安装</a></li>
<li class="chapter" data-level="3.1.2" data-path="tidyr-useage.html"><a href="tidyr-useage.html#tidyr:functions"><i class="fa fa-check"></i><b>3.1.2</b> 主要功能</a></li>
</ul></li>
<li class="chapter" data-level="3.2" data-path="pivoting.html"><a href="pivoting.html"><i class="fa fa-check"></i><b>3.2</b> 长宽转换</a>
<ul>
<li class="chapter" data-level="3.2.1" data-path="pivoting.html"><a href="pivoting.html#宽转长"><i class="fa fa-check"></i><b>3.2.1</b> 宽转长</a></li>
<li class="chapter" data-level="3.2.2" data-path="pivoting.html"><a href="pivoting.html#用法-1"><i class="fa fa-check"></i><b>3.2.2</b> 用法</a></li>
<li class="chapter" data-level="3.2.3" data-path="pivoting.html"><a href="pivoting.html#长转宽"><i class="fa fa-check"></i><b>3.2.3</b> 长转宽</a></li>
<li class="chapter" data-level="3.2.4" data-path="pivoting.html"><a href="pivoting.html#用法-2"><i class="fa fa-check"></i><b>3.2.4</b> 用法</a></li>
</ul></li>
<li class="chapter" data-level="3.3" data-path="tidyr-rectangle.html"><a href="tidyr-rectangle.html"><i class="fa fa-check"></i><b>3.3</b> 矩形数据</a></li>
<li class="chapter" data-level="3.4" data-path="tidyr-nest-data.html"><a href="tidyr-nest-data.html"><i class="fa fa-check"></i><b>3.4</b> 嵌套数据</a>
<ul>
<li class="chapter" data-level="3.4.1" data-path="tidyr-nest-data.html"><a href="tidyr-nest-data.html#基础"><i class="fa fa-check"></i><b>3.4.1</b> 基础</a></li>
<li class="chapter" data-level="3.4.2" data-path="tidyr-nest-data.html"><a href="tidyr-nest-data.html#嵌套数据和模型"><i class="fa fa-check"></i><b>3.4.2</b> 嵌套数据和模型</a></li>
</ul></li>
<li class="chapter" data-level="3.5" data-path="character-vector.html"><a href="character-vector.html"><i class="fa fa-check"></i><b>3.5</b> 字符处理</a>
<ul>
<li class="chapter" data-level="3.5.1" data-path="character-vector.html"><a href="character-vector.html#新列提取"><i class="fa fa-check"></i><b>3.5.1</b> 新列提取</a></li>
<li class="chapter" data-level="3.5.2" data-path="character-vector.html"><a href="character-vector.html#拆分"><i class="fa fa-check"></i><b>3.5.2</b> 拆分</a></li>
<li class="chapter" data-level="3.5.3" data-path="character-vector.html"><a href="character-vector.html#列拆分行"><i class="fa fa-check"></i><b>3.5.3</b> 列拆分行</a></li>
<li class="chapter" data-level="3.5.4" data-path="character-vector.html"><a href="character-vector.html#合并多列"><i class="fa fa-check"></i><b>3.5.4</b> 合并多列</a></li>
</ul></li>
<li class="chapter" data-level="3.6" data-path="tidyr-expand.html"><a href="tidyr-expand.html"><i class="fa fa-check"></i><b>3.6</b> 扩展数据框</a></li>
<li class="chapter" data-level="3.7" data-path="tidyr-fill-NA.html"><a href="tidyr-fill-NA.html"><i class="fa fa-check"></i><b>3.7</b> 缺失值</a>
<ul>
<li class="chapter" data-level="3.7.1" data-path="tidyr-fill-NA.html"><a href="tidyr-fill-NA.html#replace_na"><i class="fa fa-check"></i><b>3.7.1</b> replace_na</a></li>
<li class="chapter" data-level="3.7.2" data-path="tidyr-fill-NA.html"><a href="tidyr-fill-NA.html#fill"><i class="fa fa-check"></i><b>3.7.2</b> fill</a></li>
<li class="chapter" data-level="3.7.3" data-path="tidyr-fill-NA.html"><a href="tidyr-fill-NA.html#drop_na"><i class="fa fa-check"></i><b>3.7.3</b> drop_na</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="4" data-path="character-handling.html"><a href="character-handling.html"><i class="fa fa-check"></i><b>4</b> 字符处理</a>
<ul>
<li class="chapter" data-level="4.1" data-path="character-base-R.html"><a href="character-base-R.html"><i class="fa fa-check"></i><b>4.1</b> base R</a>
<ul>
<li class="chapter" data-level="4.1.1" data-path="character-base-R.html"><a href="character-base-R.html#单双引号"><i class="fa fa-check"></i><b>4.1.1</b> 单双引号</a></li>
<li class="chapter" data-level="4.1.2" data-path="character-base-R.html"><a href="character-base-R.html#转义"><i class="fa fa-check"></i><b>4.1.2</b> 转义</a></li>
<li class="chapter" data-level="4.1.3" data-path="character-base-R.html"><a href="character-base-R.html#常用函数"><i class="fa fa-check"></i><b>4.1.3</b> 常用函数</a></li>
<li class="chapter" data-level="4.1.4" data-path="character-base-R.html"><a href="character-base-R.html#newfeatures"><i class="fa fa-check"></i><b>4.1.4</b> 新特性</a></li>
</ul></li>
<li class="chapter" data-level="4.2" data-path="character-stringr-packages.html"><a href="character-stringr-packages.html"><i class="fa fa-check"></i><b>4.2</b> stringr</a>
<ul>
<li class="chapter" data-level="4.2.1" data-path="character-stringr-packages.html"><a href="character-stringr-packages.html#stringr-install"><i class="fa fa-check"></i><b>4.2.1</b> 安装</a></li>
<li class="chapter" data-level="4.2.2" data-path="character-stringr-packages.html"><a href="character-stringr-packages.html#stringr-usage"><i class="fa fa-check"></i><b>4.2.2</b> 基本使用</a></li>
<li class="chapter" data-level="4.2.3" data-path="character-stringr-packages.html"><a href="character-stringr-packages.html#stringr-functions"><i class="fa fa-check"></i><b>4.2.3</b> 常用函数</a></li>
</ul></li>
<li class="chapter" data-level="4.3" data-path="character-application.html"><a href="character-application.html"><i class="fa fa-check"></i><b>4.3</b> 综合运用</a>
<ul>
<li class="chapter" data-level="4.3.1" data-path="character-application.html"><a href="character-application.html#实现excel函数"><i class="fa fa-check"></i><b>4.3.1</b> 实现excel函数</a></li>
<li class="chapter" data-level="4.3.2" data-path="character-application.html"><a href="character-application.html#使用案例"><i class="fa fa-check"></i><b>4.3.2</b> 使用案例</a></li>
</ul></li>
<li class="chapter" data-level="4.4" data-path="character-the-difference-stringr-and-base.html"><a href="character-the-difference-stringr-and-base.html"><i class="fa fa-check"></i><b>4.4</b> base 和 stringr</a></li>
<li class="chapter" data-level="4.5" data-path="character-reference-material.html"><a href="character-reference-material.html"><i class="fa fa-check"></i><b>4.5</b> 参考资料</a></li>
</ul></li>
<li class="chapter" data-level="5" data-path="datetime.html"><a href="datetime.html"><i class="fa fa-check"></i><b>5</b> 时间处理</a>
<ul>
<li class="chapter" data-level="5.1" data-path="datetime-base-R.html"><a href="datetime-base-R.html"><i class="fa fa-check"></i><b>5.1</b> base R</a>
<ul>
<li class="chapter" data-level="5.1.1" data-path="datetime-base-R.html"><a href="datetime-base-R.html#the-date-class"><i class="fa fa-check"></i><b>5.1.1</b> Date</a></li>
<li class="chapter" data-level="5.1.2" data-path="datetime-base-R.html"><a href="datetime-base-R.html#the-POSIXct-class"><i class="fa fa-check"></i><b>5.1.2</b> POSIXct</a></li>
<li class="chapter" data-level="5.1.3" data-path="datetime-base-R.html"><a href="datetime-base-R.html#the-POSIXlt-class"><i class="fa fa-check"></i><b>5.1.3</b> POSIXlt</a></li>
</ul></li>
<li class="chapter" data-level="5.2" data-path="lubridate.html"><a href="lubridate.html"><i class="fa fa-check"></i><b>5.2</b> lubridate</a>
<ul>
<li class="chapter" data-level="5.2.1" data-path="lubridate.html"><a href="lubridate.html#lubridate-install"><i class="fa fa-check"></i><b>5.2.1</b> 安装包</a></li>
<li class="chapter" data-level="5.2.2" data-path="lubridate.html"><a href="lubridate.html#get-current-datetime"><i class="fa fa-check"></i><b>5.2.2</b> 当前时间日期</a></li>
<li class="chapter" data-level="5.2.3" data-path="lubridate.html"><a href="lubridate.html#make-datetime"><i class="fa fa-check"></i><b>5.2.3</b> 构造日期时间</a></li>
<li class="chapter" data-level="5.2.4" data-path="lubridate.html"><a href="lubridate.html#parse-datetime"><i class="fa fa-check"></i><b>5.2.4</b> 解析日期时间</a></li>
<li class="chapter" data-level="5.2.5" data-path="lubridate.html"><a href="lubridate.html#extracting-datetime-information"><i class="fa fa-check"></i><b>5.2.5</b> 提取日期时间成分</a></li>
<li class="chapter" data-level="5.2.6" data-path="lubridate.html"><a href="lubridate.html#time-zones"><i class="fa fa-check"></i><b>5.2.6</b> 处理时区</a></li>
<li class="chapter" data-level="5.2.7" data-path="lubridate.html"><a href="lubridate.html#interveal"><i class="fa fa-check"></i><b>5.2.7</b> 时间间隔</a></li>
<li class="chapter" data-level="5.2.8" data-path="lubridate.html"><a href="lubridate.html#calculate-datetime"><i class="fa fa-check"></i><b>5.2.8</b> 时间日期计算</a></li>
</ul></li>
<li class="chapter" data-level="5.3" data-path="datetime-application.html"><a href="datetime-application.html"><i class="fa fa-check"></i><b>5.3</b> 综合运用</a>
<ul>
<li class="chapter" data-level="5.3.1" data-path="datetime-application.html"><a href="datetime-application.html#日报同环比计算"><i class="fa fa-check"></i><b>5.3.1</b> 日报同环比计算</a></li>
<li class="chapter" data-level="5.3.2" data-path="datetime-application.html"><a href="datetime-application.html#清洗不同类型日期格式"><i class="fa fa-check"></i><b>5.3.2</b> 清洗不同类型日期格式</a></li>
<li class="chapter" data-level="5.3.3" data-path="datetime-application.html"><a href="datetime-application.html#扫码后中奖时间匹配"><i class="fa fa-check"></i><b>5.3.3</b> 扫码后中奖时间匹配</a></li>
</ul></li>
<li class="chapter" data-level="5.4" data-path="datetime-additional-information.html"><a href="datetime-additional-information.html"><i class="fa fa-check"></i><b>5.4</b> 补充资料</a>
<ul>
<li class="chapter" data-level="5.4.1" data-path="datetime-additional-information.html"><a href="datetime-additional-information.html#excel-and-r"><i class="fa fa-check"></i><b>5.4.1</b> Excel and R</a></li>
<li class="chapter" data-level="5.4.2" data-path="datetime-additional-information.html"><a href="datetime-additional-information.html#参考资料-1"><i class="fa fa-check"></i><b>5.4.2</b> 参考资料</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="6" data-path="forcats.html"><a href="forcats.html"><i class="fa fa-check"></i><b>6</b> 因子介绍</a>
<ul>
<li class="chapter" data-level="6.1" data-path="forcats-introduction.html"><a href="forcats-introduction.html"><i class="fa fa-check"></i><b>6.1</b> 介绍</a>
<ul>
<li class="chapter" data-level="6.1.1" data-path="forcats-introduction.html"><a href="forcats-introduction.html#forcats:install"><i class="fa fa-check"></i><b>6.1.1</b> 安装</a></li>
</ul></li>
<li class="chapter" data-level="6.2" data-path="forcats-usage.html"><a href="forcats-usage.html"><i class="fa fa-check"></i><b>6.2</b> 用法</a>
<ul>
<li class="chapter" data-level="6.2.1" data-path="forcats-usage.html"><a href="forcats-usage.html#创建因子"><i class="fa fa-check"></i><b>6.2.1</b> 创建因子</a></li>
<li class="chapter" data-level="6.2.2" data-path="forcats-usage.html"><a href="forcats-usage.html#修改因子顺序"><i class="fa fa-check"></i><b>6.2.2</b> 修改因子顺序</a></li>
<li class="chapter" data-level="6.2.3" data-path="forcats-usage.html"><a href="forcats-usage.html#修改因子级别"><i class="fa fa-check"></i><b>6.2.3</b> 修改因子级别</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="7" data-path="Data-Manipulation-datatable.html"><a href="Data-Manipulation-datatable.html"><i class="fa fa-check"></i><b>7</b> data.table</a>
<ul>
<li class="chapter" data-level="7.1" data-path="datatable-description.html"><a href="datatable-description.html"><i class="fa fa-check"></i><b>7.1</b> 基础介绍</a>
<ul>
<li class="chapter" data-level="7.1.1" data-path="datatable-description.html"><a href="datatable-description.html#读取数据"><i class="fa fa-check"></i><b>7.1.1</b> 读取数据</a></li>
<li class="chapter" data-level="7.1.2" data-path="datatable-description.html"><a href="datatable-description.html#基本格式"><i class="fa fa-check"></i><b>7.1.2</b> 基本格式</a></li>
<li class="chapter" data-level="7.1.3" data-path="datatable-description.html"><a href="datatable-description.html#i-j-by-使用"><i class="fa fa-check"></i><b>7.1.3</b> i j by 使用</a></li>
<li class="chapter" data-level="7.1.4" data-path="datatable-description.html"><a href="datatable-description.html#行列筛选总结"><i class="fa fa-check"></i><b>7.1.4</b> 行列筛选总结</a></li>
</ul></li>
<li class="chapter" data-level="7.2" data-path="datatable-usage.html"><a href="datatable-usage.html"><i class="fa fa-check"></i><b>7.2</b> 常规操作</a>
<ul>
<li class="chapter" data-level="7.2.1" data-path="datatable-usage.html"><a href="datatable-usage.html#行筛选"><i class="fa fa-check"></i><b>7.2.1</b> 行筛选</a></li>
<li class="chapter" data-level="7.2.2" data-path="datatable-usage.html"><a href="datatable-usage.html#新增更新列"><i class="fa fa-check"></i><b>7.2.2</b> 新增更新列</a></li>
<li class="chapter" data-level="7.2.3" data-path="datatable-usage.html"><a href="datatable-usage.html#排序"><i class="fa fa-check"></i><b>7.2.3</b> 排序</a></li>
</ul></li>
<li class="chapter" data-level="7.3" data-path="datatable-function.html"><a href="datatable-function.html"><i class="fa fa-check"></i><b>7.3</b> 常用函数</a>
<ul>
<li class="chapter" data-level="7.3.1" data-path="datatable-function.html"><a href="datatable-function.html#特殊符号"><i class="fa fa-check"></i><b>7.3.1</b> 特殊符号</a></li>
<li class="chapter" data-level="7.3.2" data-path="datatable-function.html"><a href="datatable-function.html#排序函数-1"><i class="fa fa-check"></i><b>7.3.2</b> 排序函数</a></li>
<li class="chapter" data-level="7.3.3" data-path="datatable-function.html"><a href="datatable-function.html#非重复计数"><i class="fa fa-check"></i><b>7.3.3</b> 非重复计数</a></li>
<li class="chapter" data-level="7.3.4" data-path="datatable-function.html"><a href="datatable-function.html#判断函数"><i class="fa fa-check"></i><b>7.3.4</b> 判断函数</a></li>
<li class="chapter" data-level="7.3.5" data-path="datatable-function.html"><a href="datatable-function.html#交集-差集-合并"><i class="fa fa-check"></i><b>7.3.5</b> 交集 差集 合并</a></li>
<li class="chapter" data-level="7.3.6" data-path="datatable-function.html"><a href="datatable-function.html#长宽转换"><i class="fa fa-check"></i><b>7.3.6</b> 长宽转换</a></li>
<li class="chapter" data-level="7.3.7" data-path="datatable-function.html"><a href="datatable-function.html#表连接"><i class="fa fa-check"></i><b>7.3.7</b> 表连接</a></li>
</ul></li>
<li class="chapter" data-level="7.4" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html"><i class="fa fa-check"></i><b>7.4</b> 高级函数</a>
<ul>
<li class="chapter" data-level="7.4.1" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html#groupingsets"><i class="fa fa-check"></i><b>7.4.1</b> groupingsets</a></li>
<li class="chapter" data-level="7.4.2" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html#rleid"><i class="fa fa-check"></i><b>7.4.2</b> rleid</a></li>
<li class="chapter" data-level="7.4.3" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html#shift"><i class="fa fa-check"></i><b>7.4.3</b> shift</a></li>
<li class="chapter" data-level="7.4.4" data-path="datatable-advanced-functions.html"><a href="datatable-advanced-functions.html#j"><i class="fa fa-check"></i><b>7.4.4</b> J</a></li>
</ul></li>
<li class="chapter" data-level="7.5" data-path="datatable-tips.html"><a href="datatable-tips.html"><i class="fa fa-check"></i><b>7.5</b> 小技巧</a>
<ul>
<li class="chapter" data-level="7.5.1" data-path="datatable-tips.html"><a href="datatable-tips.html#用抑制中间过程输出"><i class="fa fa-check"></i><b>7.5.1</b> 用{}抑制中间过程输出</a></li>
<li class="chapter" data-level="7.5.2" data-path="datatable-tips.html"><a href="datatable-tips.html#使用打印data.table"><i class="fa fa-check"></i><b>7.5.2</b> 使用[]打印data.table</a></li>
</ul></li>
<li class="chapter" data-level="7.6" data-path="datatable-application.html"><a href="datatable-application.html"><i class="fa fa-check"></i><b>7.6</b> 运用</a>
<ul>
<li class="chapter" data-level="7.6.1" data-path="datatable-application.html"><a href="datatable-application.html#自定义函数计算"><i class="fa fa-check"></i><b>7.6.1</b> 自定义函数计算</a></li>
<li class="chapter" data-level="7.6.2" data-path="datatable-application.html"><a href="datatable-application.html#带汇总的聚合运算"><i class="fa fa-check"></i><b>7.6.2</b> 带汇总的聚合运算</a></li>
<li class="chapter" data-level="7.6.3" data-path="datatable-application.html"><a href="datatable-application.html#行列转变"><i class="fa fa-check"></i><b>7.6.3</b> 行列转变</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="8" data-path="database.html"><a href="database.html"><i class="fa fa-check"></i><b>8</b> database</a>
<ul>
<li class="chapter" data-level="8.1" data-path="database-install.html"><a href="database-install.html"><i class="fa fa-check"></i><b>8.1</b> 安装数据库</a></li>
<li class="chapter" data-level="8.2" data-path="database-odbc-package.html"><a href="database-odbc-package.html"><i class="fa fa-check"></i><b>8.2</b> odbc包</a>
<ul>
<li class="chapter" data-level="8.2.1" data-path="database-odbc-package.html"><a href="database-odbc-package.html#安装包"><i class="fa fa-check"></i><b>8.2.1</b> 安装包</a></li>
<li class="chapter" data-level="8.2.2" data-path="database-odbc-package.html"><a href="database-odbc-package.html#驱动安装"><i class="fa fa-check"></i><b>8.2.2</b> 驱动安装</a></li>
<li class="chapter" data-level="8.2.3" data-path="database-odbc-package.html"><a href="database-odbc-package.html#连接数据库"><i class="fa fa-check"></i><b>8.2.3</b> 连接数据库</a></li>
<li class="chapter" data-level="8.2.4" data-path="database-odbc-package.html"><a href="database-odbc-package.html#读写数据库"><i class="fa fa-check"></i><b>8.2.4</b> 读写数据库</a></li>
</ul></li>
<li class="chapter" data-level="8.3" data-path="database-DBI-package.html"><a href="database-DBI-package.html"><i class="fa fa-check"></i><b>8.3</b> DBI包</a>
<ul>
<li class="chapter" data-level="8.3.1" data-path="database-DBI-package.html"><a href="database-DBI-package.html#安装-1"><i class="fa fa-check"></i><b>8.3.1</b> 安装</a></li>
<li class="chapter" data-level="8.3.2" data-path="database-DBI-package.html"><a href="database-DBI-package.html#连接数据库-1"><i class="fa fa-check"></i><b>8.3.2</b> 连接数据库</a></li>
<li class="chapter" data-level="8.3.3" data-path="database-DBI-package.html"><a href="database-DBI-package.html#读写数据库-1"><i class="fa fa-check"></i><b>8.3.3</b> 读写数据库</a></li>
<li class="chapter" data-level="8.3.4" data-path="database-DBI-package.html"><a href="database-DBI-package.html#其它函数介绍"><i class="fa fa-check"></i><b>8.3.4</b> 其它函数介绍</a></li>
</ul></li>
<li class="chapter" data-level="8.4" data-path="database-else-package.html"><a href="database-else-package.html"><i class="fa fa-check"></i><b>8.4</b> 其他R包</a>
<ul>
<li class="chapter" data-level="8.4.1" data-path="database-else-package.html"><a href="database-else-package.html#rodbc包"><i class="fa fa-check"></i><b>8.4.1</b> RODBC包</a></li>
<li class="chapter" data-level="8.4.2" data-path="database-else-package.html"><a href="database-else-package.html#roracle包"><i class="fa fa-check"></i><b>8.4.2</b> ROracle包</a></li>
<li class="chapter" data-level="8.4.3" data-path="database-else-package.html"><a href="database-else-package.html#rmysql包"><i class="fa fa-check"></i><b>8.4.3</b> RMySQL包</a></li>
<li class="chapter" data-level="8.4.4" data-path="database-else-package.html"><a href="database-else-package.html#rsqlite"><i class="fa fa-check"></i><b>8.4.4</b> RSQLite</a></li>
</ul></li>
<li class="chapter" data-level="8.5" data-path="database-big-data.html"><a href="database-big-data.html"><i class="fa fa-check"></i><b>8.5</b> 大数据相关R包</a>
<ul>
<li class="chapter" data-level="8.5.1" data-path="database-big-data.html"><a href="database-big-data.html#sparklyr"><i class="fa fa-check"></i><b>8.5.1</b> sparklyr</a></li>
<li class="chapter" data-level="8.5.2" data-path="database-big-data.html"><a href="database-big-data.html#RClickhouse"><i class="fa fa-check"></i><b>8.5.2</b> RClickhouse</a></li>
</ul></li>
<li class="chapter" data-level="8.6" data-path="database-FAQ.html"><a href="database-FAQ.html"><i class="fa fa-check"></i><b>8.6</b> 常见问题</a>
<ul>
<li class="chapter" data-level="8.6.1" data-path="database-FAQ.html"><a href="database-FAQ.html#乱码问题"><i class="fa fa-check"></i><b>8.6.1</b> 乱码问题</a></li>
<li class="chapter" data-level="8.6.2" data-path="database-FAQ.html"><a href="database-FAQ.html#无法连接问题"><i class="fa fa-check"></i><b>8.6.2</b> 无法连接问题</a></li>
<li class="chapter" data-level="8.6.3" data-path="database-FAQ.html"><a href="database-FAQ.html#远程连接"><i class="fa fa-check"></i><b>8.6.3</b> 远程连接</a></li>
<li class="chapter" data-level="8.6.4" data-path="database-FAQ.html"><a href="database-FAQ.html#跳板机连接"><i class="fa fa-check"></i><b>8.6.4</b> 跳板机连接</a></li>
</ul></li>
<li class="chapter" data-level="8.7" data-path="database-dbplyr-package.html"><a href="database-dbplyr-package.html"><i class="fa fa-check"></i><b>8.7</b> dbplyr</a>
<ul>
<li class="chapter" data-level="8.7.1" data-path="database-dbplyr-package.html"><a href="database-dbplyr-package.html#安装-2"><i class="fa fa-check"></i><b>8.7.1</b> 安装</a></li>
<li class="chapter" data-level="8.7.2" data-path="database-dbplyr-package.html"><a href="database-dbplyr-package.html#基础用法-1"><i class="fa fa-check"></i><b>8.7.2</b> 基础用法</a></li>
<li class="chapter" data-level="8.7.3" data-path="database-dbplyr-package.html"><a href="database-dbplyr-package.html#无法正确转化"><i class="fa fa-check"></i><b>8.7.3</b> 无法正确转化</a></li>
</ul></li>
<li class="chapter" data-level="8.8" data-path="database-reference-material.html"><a href="database-reference-material.html"><i class="fa fa-check"></i><b>8.8</b> 参考资料</a></li>
</ul></li>
<li class="chapter" data-level="9" data-path="R-loop-structure.html"><a href="R-loop-structure.html"><i class="fa fa-check"></i><b>9</b> 循环结构</a>
<ul>
<li class="chapter" data-level="9.1" data-path="R-loop-description.html"><a href="R-loop-description.html"><i class="fa fa-check"></i><b>9.1</b> R循环介绍</a>
<ul>
<li class="chapter" data-level="9.1.1" data-path="R-loop-description.html"><a href="R-loop-description.html#R:loop-example"><i class="fa fa-check"></i><b>9.1.1</b> 简单示例</a></li>
<li class="chapter" data-level="9.1.2" data-path="R-loop-description.html"><a href="R-loop-description.html#three:loop-structure"><i class="fa fa-check"></i><b>9.1.2</b> 循环结构</a></li>
<li class="chapter" data-level="9.1.3" data-path="R-loop-description.html"><a href="R-loop-description.html#loop:control"><i class="fa fa-check"></i><b>9.1.3</b> 循环控制</a></li>
<li class="chapter" data-level="9.1.4" data-path="R-loop-description.html"><a href="R-loop-description.html#嵌套循环"><i class="fa fa-check"></i><b>9.1.4</b> 嵌套循环</a></li>
</ul></li>
<li class="chapter" data-level="9.2" data-path="loop-changes.html"><a href="loop-changes.html"><i class="fa fa-check"></i><b>9.2</b> 循环变化</a>
<ul>
<li class="chapter" data-level="9.2.1" data-path="loop-changes.html"><a href="loop-changes.html#修改已有对象"><i class="fa fa-check"></i><b>9.2.1</b> 修改已有对象</a></li>
<li class="chapter" data-level="9.2.2" data-path="loop-changes.html"><a href="loop-changes.html#循环模式"><i class="fa fa-check"></i><b>9.2.2</b> 循环模式</a></li>
<li class="chapter" data-level="9.2.3" data-path="loop-changes.html"><a href="loop-changes.html#未知长度输出"><i class="fa fa-check"></i><b>9.2.3</b> 未知长度输出</a></li>
</ul></li>
<li class="chapter" data-level="9.3" data-path="apply-function.html"><a href="apply-function.html"><i class="fa fa-check"></i><b>9.3</b> apply系列函数</a>
<ul>
<li class="chapter" data-level="9.3.1" data-path="apply-function.html"><a href="apply-function.html#lapply"><i class="fa fa-check"></i><b>9.3.1</b> lapply 循环迭代</a></li>
<li class="chapter" data-level="9.3.2" data-path="apply-function.html"><a href="apply-function.html#sapply"><i class="fa fa-check"></i><b>9.3.2</b> sapply</a></li>
<li class="chapter" data-level="9.3.3" data-path="apply-function.html"><a href="apply-function.html#vapply"><i class="fa fa-check"></i><b>9.3.3</b> vapply 迭代安全函数</a></li>
<li class="chapter" data-level="9.3.4" data-path="apply-function.html"><a href="apply-function.html#apply"><i class="fa fa-check"></i><b>9.3.4</b> apply 多维数据</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="10" data-path="purrr-Iteration.html"><a href="purrr-Iteration.html"><i class="fa fa-check"></i><b>10</b> 循环迭代purrr介绍</a>
<ul>
<li class="chapter" data-level="10.1" data-path="安装-3.html"><a href="安装-3.html"><i class="fa fa-check"></i><b>10.1</b> 安装</a></li>
<li class="chapter" data-level="10.2" data-path="purrr-basic-usage.html"><a href="purrr-basic-usage.html"><i class="fa fa-check"></i><b>10.2</b> 常规用法</a>
<ul>
<li class="chapter" data-level="10.2.1" data-path="purrr-basic-usage.html"><a href="purrr-basic-usage.html#map-系列"><i class="fa fa-check"></i><b>10.2.1</b> map 系列</a></li>
<li class="chapter" data-level="10.2.2" data-path="purrr-basic-usage.html"><a href="purrr-basic-usage.html#pmap-系列"><i class="fa fa-check"></i><b>10.2.2</b> pmap 系列</a></li>
</ul></li>
<li class="chapter" data-level="10.3" data-path="purrr-map.html"><a href="purrr-map.html"><i class="fa fa-check"></i><b>10.3</b> map系列函数</a>
<ul>
<li class="chapter" data-level="10.3.1" data-path="purrr-map.html"><a href="purrr-map.html#用法-3"><i class="fa fa-check"></i><b>10.3.1</b> 用法</a></li>
<li class="chapter" data-level="10.3.2" data-path="purrr-map.html"><a href="purrr-map.html#案例-5"><i class="fa fa-check"></i><b>10.3.2</b> 案例</a></li>
</ul></li>
<li class="chapter" data-level="10.4" data-path="purrr-map2.html"><a href="purrr-map2.html"><i class="fa fa-check"></i><b>10.4</b> map2 系列函数</a></li>
<li class="chapter" data-level="10.5" data-path="purrr-multi-parameter.html"><a href="purrr-multi-parameter.html"><i class="fa fa-check"></i><b>10.5</b> pmap系列函数</a></li>
<li class="chapter" data-level="10.6" data-path="purrr-reduce.html"><a href="purrr-reduce.html"><i class="fa fa-check"></i><b>10.6</b> 归约累计函数</a>
<ul>
<li class="chapter" data-level="10.6.1" data-path="purrr-reduce.html"><a href="purrr-reduce.html#reduce-函数"><i class="fa fa-check"></i><b>10.6.1</b> reduce 函数</a></li>
<li class="chapter" data-level="10.6.2" data-path="purrr-reduce.html"><a href="purrr-reduce.html#accumulate-函数"><i class="fa fa-check"></i><b>10.6.2</b> accumulate 函数</a></li>
</ul></li>
<li class="chapter" data-level="10.7" data-path="purrr-safely-functions.html"><a href="purrr-safely-functions.html"><i class="fa fa-check"></i><b>10.7</b> 安全函数</a></li>
<li class="chapter" data-level="10.8" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html"><i class="fa fa-check"></i><b>10.8</b> 其他函数介绍</a>
<ul>
<li class="chapter" data-level="10.8.1" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#flatten-系列"><i class="fa fa-check"></i><b>10.8.1</b> flatten 系列</a></li>
<li class="chapter" data-level="10.8.2" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#imap-函数"><i class="fa fa-check"></i><b>10.8.2</b> imap 函数</a></li>
<li class="chapter" data-level="10.8.3" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#walk-系列"><i class="fa fa-check"></i><b>10.8.3</b> walk 系列</a></li>
<li class="chapter" data-level="10.8.4" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#逻辑判断函数"><i class="fa fa-check"></i><b>10.8.4</b> 逻辑判断函数</a></li>
<li class="chapter" data-level="10.8.5" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#提取函数"><i class="fa fa-check"></i><b>10.8.5</b> 提取函数</a></li>
<li class="chapter" data-level="10.8.6" data-path="purrr-else-functions.html"><a href="purrr-else-functions.html#筛选函数"><i class="fa fa-check"></i><b>10.8.6</b> 筛选函数</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="11" data-path="self-define-function.html"><a href="self-define-function.html"><i class="fa fa-check"></i><b>11</b> 自定义函数</a>
<ul>
<li class="chapter" data-level="11.1" data-path="define-function-example.html"><a href="define-function-example.html"><i class="fa fa-check"></i><b>11.1</b> 简单示例</a></li>
<li class="chapter" data-level="11.2" data-path="define-function-conditional-execution.html"><a href="define-function-conditional-execution.html"><i class="fa fa-check"></i><b>11.2</b> 条件执行</a>
<ul>
<li class="chapter" data-level="11.2.1" data-path="define-function-conditional-execution.html"><a href="define-function-conditional-execution.html#多条件执行"><i class="fa fa-check"></i><b>11.2.1</b> 多条件执行</a></li>
</ul></li>
<li class="chapter" data-level="11.3" data-path="define-function-parameter.html"><a href="define-function-parameter.html"><i class="fa fa-check"></i><b>11.3</b> 函数参数</a>
<ul>
<li class="chapter" data-level="11.3.1" data-path="define-function-parameter.html"><a href="define-function-parameter.html#参数名称"><i class="fa fa-check"></i><b>11.3.1</b> 参数名称</a></li>
<li class="chapter" data-level="11.3.2" data-path="define-function-parameter.html"><a href="define-function-parameter.html#检查参数值"><i class="fa fa-check"></i><b>11.3.2</b> 检查参数值</a></li>
<li class="chapter" data-level="11.3.3" data-path="define-function-parameter.html"><a href="define-function-parameter.html#参数-5"><i class="fa fa-check"></i><b>11.3.3</b> …参数</a></li>
</ul></li>
<li class="chapter" data-level="11.4" data-path="function-return.html"><a href="function-return.html"><i class="fa fa-check"></i><b>11.4</b> 返回值</a>
<ul>
<li class="chapter" data-level="11.4.1" data-path="function-return.html"><a href="function-return.html#显式返回"><i class="fa fa-check"></i><b>11.4.1</b> 显式返回</a></li>
<li class="chapter" data-level="11.4.2" data-path="function-return.html"><a href="function-return.html#编写管道函数"><i class="fa fa-check"></i><b>11.4.2</b> 编写管道函数</a></li>
</ul></li>
<li class="chapter" data-level="11.5" data-path="function-environment.html"><a href="function-environment.html"><i class="fa fa-check"></i><b>11.5</b> 环境</a></li>
<li class="chapter" data-level="11.6" data-path="function-expand.html"><a href="function-expand.html"><i class="fa fa-check"></i><b>11.6</b> 拓展部分</a></li>
</ul></li>
<li class="chapter" data-level="12" data-path="file-system-operation.html"><a href="file-system-operation.html"><i class="fa fa-check"></i><b>12</b> R语言文件系统操作</a>
<ul>
<li class="chapter" data-level="12.1" data-path="file-base-r.html"><a href="file-base-r.html"><i class="fa fa-check"></i><b>12.1</b> base R</a>
<ul>
<li class="chapter" data-level="12.1.1" data-path="file-base-r.html"><a href="file-base-r.html#base:r-usage"><i class="fa fa-check"></i><b>12.1.1</b> 用法</a></li>
</ul></li>
<li class="chapter" data-level="12.2" data-path="fs-package.html"><a href="fs-package.html"><i class="fa fa-check"></i><b>12.2</b> fs package</a>
<ul>
<li class="chapter" data-level="12.2.1" data-path="fs-package.html"><a href="fs-package.html#fs-install"><i class="fa fa-check"></i><b>12.2.1</b> 安装</a></li>
<li class="chapter" data-level="12.2.2" data-path="fs-package.html"><a href="fs-package.html#fs-advanced"><i class="fa fa-check"></i><b>12.2.2</b> 优势</a></li>
<li class="chapter" data-level="12.2.3" data-path="fs-package.html"><a href="fs-package.html#fs-usage"><i class="fa fa-check"></i><b>12.2.3</b> 基础用法</a></li>
</ul></li>
<li class="chapter" data-level="12.3" data-path="fs-functions.html"><a href="fs-functions.html"><i class="fa fa-check"></i><b>12.3</b> fs函数介绍</a>
<ul>
<li class="chapter" data-level="12.3.1" data-path="fs-functions.html"><a href="fs-functions.html#fs-file-manipulation"><i class="fa fa-check"></i><b>12.3.1</b> 文件操作</a></li>
<li class="chapter" data-level="12.3.2" data-path="fs-functions.html"><a href="fs-functions.html#fs-dir-manipulation"><i class="fa fa-check"></i><b>12.3.2</b> 目录操作</a></li>
<li class="chapter" data-level="12.3.3" data-path="fs-functions.html"><a href="fs-functions.html#fs-link-manipulation"><i class="fa fa-check"></i><b>12.3.3</b> 链接操作</a></li>
<li class="chapter" data-level="12.3.4" data-path="fs-functions.html"><a href="fs-functions.html#fs-path-manipulation"><i class="fa fa-check"></i><b>12.3.4</b> 路径操作</a></li>
<li class="chapter" data-level="12.3.5" data-path="fs-functions.html"><a href="fs-functions.html#fs-help-manipulation"><i class="fa fa-check"></i><b>12.3.5</b> 辅助函数</a></li>
</ul></li>
<li class="chapter" data-level="12.4" data-path="file-base-fs-difference.html"><a href="file-base-fs-difference.html"><i class="fa fa-check"></i><b>12.4</b> base-fs-shell比较</a></li>
<li class="chapter" data-level="12.5" data-path="file-manipulation-reference-material.html"><a href="file-manipulation-reference-material.html"><i class="fa fa-check"></i><b>12.5</b> 参考资料</a></li>
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<div id="datatable:advanced-functions" class="section level2" number="7.4">
<h2><span class="header-section-number">7.4</span> 高级函数</h2>
<p>高级函数并不是指使用难度，而是使用频率可能不高，但在实现某些功能时特别便利的函数。</p>
<p>如分组聚合的<code>groupingsets</code>,前后移动的<code>shift</code>等函数。</p>
<div id="groupingsets" class="section level3" number="7.4.1">
<h3><span class="header-section-number">7.4.1</span> groupingsets</h3>
<p>产生多个层次的合计数据，与<code>sql</code>中的<a href="https://www.postgresql.org/docs/9.5/queries-table-expressions.html#QUERIES-GROUPING-SETS">grouping set</a>功能相似。</p>
<p><strong>用法</strong></p>
<div class="sourceCode" id="cb428"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb428-1"><a href="datatable-advanced-functions.html#cb428-1" aria-hidden="true" tabindex="-1"></a><span class="fu">rollup</span>(x, j, by, .SDcols, <span class="at">id =</span> <span class="cn">FALSE</span>, ...)</span>
<span id="cb428-2"><a href="datatable-advanced-functions.html#cb428-2" aria-hidden="true" tabindex="-1"></a><span class="fu">groupingsets</span>(x, j, by, sets, .SDcols, <span class="at">id =</span> <span class="cn">FALSE</span>, jj, ...)</span>
<span id="cb428-3"><a href="datatable-advanced-functions.html#cb428-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb428-4"><a href="datatable-advanced-functions.html#cb428-4" aria-hidden="true" tabindex="-1"></a><span class="co"># rollup</span></span>
<span id="cb428-5"><a href="datatable-advanced-functions.html#cb428-5" aria-hidden="true" tabindex="-1"></a><span class="fu">rollup</span>(DT, <span class="at">j =</span> <span class="fu">lapply</span>(.SD, sum), <span class="at">by =</span> <span class="fu">c</span>(<span class="st">&quot;color&quot;</span>,<span class="st">&quot;year&quot;</span>,<span class="st">&quot;status&quot;</span>), <span class="at">id=</span><span class="cn">TRUE</span>, <span class="at">.SDcols=</span><span class="st">&quot;value&quot;</span>)</span>
<span id="cb428-6"><a href="datatable-advanced-functions.html#cb428-6" aria-hidden="true" tabindex="-1"></a><span class="fu">rollup</span>(DT, <span class="at">j =</span> <span class="fu">c</span>(<span class="fu">list</span>(<span class="at">count=</span>.N), <span class="fu">lapply</span>(.SD, sum)), <span class="at">by =</span> <span class="fu">c</span>(<span class="st">&quot;color&quot;</span>,<span class="st">&quot;year&quot;</span>,<span class="st">&quot;status&quot;</span>), <span class="at">id=</span><span class="cn">TRUE</span>)</span></code></pre></div>
<p>如果要达到像Excel中透视表一样的效果，如下所示:</p>
<div class="figure">
<img src="picture/data-table/Excel-pivot-groupingsets.png" alt="" />
<p class="caption">Excel groupingsets透视表</p>
</div>
<ul>
<li>rollup</li>
</ul>
<div class="sourceCode" id="cb429"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb429-1"><a href="datatable-advanced-functions.html#cb429-1" aria-hidden="true" tabindex="-1"></a><span class="fu">library</span>(magrittr)</span>
<span id="cb429-2"><a href="datatable-advanced-functions.html#cb429-2" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; </span></span>
<span id="cb429-3"><a href="datatable-advanced-functions.html#cb429-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 载入程辑包：&#39;magrittr&#39;</span></span>
<span id="cb429-4"><a href="datatable-advanced-functions.html#cb429-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; The following object is masked from &#39;package:purrr&#39;:</span></span>
<span id="cb429-5"><a href="datatable-advanced-functions.html#cb429-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; </span></span>
<span id="cb429-6"><a href="datatable-advanced-functions.html#cb429-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;     set_names</span></span>
<span id="cb429-7"><a href="datatable-advanced-functions.html#cb429-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; The following object is masked from &#39;package:tidyr&#39;:</span></span>
<span id="cb429-8"><a href="datatable-advanced-functions.html#cb429-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; </span></span>
<span id="cb429-9"><a href="datatable-advanced-functions.html#cb429-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;     extract</span></span>
<span id="cb429-10"><a href="datatable-advanced-functions.html#cb429-10" aria-hidden="true" tabindex="-1"></a>DT <span class="ot">&lt;-</span> <span class="fu">fread</span>(<span class="st">&#39;./data/data-table-groupingsets.csv&#39;</span>,<span class="at">encoding =</span> <span class="st">&#39;UTF-8&#39;</span>)</span>
<span id="cb429-11"><a href="datatable-advanced-functions.html#cb429-11" aria-hidden="true" tabindex="-1"></a>(<span class="fu">rollup</span>(DT,<span class="at">j =</span><span class="fu">list</span>(以下项目的总和 <span class="ot">=</span><span class="fu">sum</span>(value)),<span class="at">by =</span> <span class="fu">c</span>(<span class="st">&quot;area&quot;</span>,<span class="st">&quot;store_type&quot;</span>),<span class="at">id =</span> <span class="cn">TRUE</span>) <span class="sc">%&gt;%</span> <span class="fu">setorderv</span>(<span class="at">cols=</span><span class="fu">c</span>(<span class="st">&#39;area&#39;</span>,<span class="st">&#39;grouping&#39;</span>),<span class="at">na.last =</span> <span class="cn">TRUE</span>))</span>
<span id="cb429-12"><a href="datatable-advanced-functions.html#cb429-12" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;     grouping area store_type 以下项目的总和</span></span>
<span id="cb429-13"><a href="datatable-advanced-functions.html#cb429-13" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  1:        0 华东     不可比              9</span></span>
<span id="cb429-14"><a href="datatable-advanced-functions.html#cb429-14" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  2:        0 华东       可比            309</span></span>
<span id="cb429-15"><a href="datatable-advanced-functions.html#cb429-15" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  3:        1 华东       &lt;NA&gt;            318</span></span>
<span id="cb429-16"><a href="datatable-advanced-functions.html#cb429-16" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  4:        0 华北     不可比             72</span></span>
<span id="cb429-17"><a href="datatable-advanced-functions.html#cb429-17" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  5:        0 华北       可比            173</span></span>
<span id="cb429-18"><a href="datatable-advanced-functions.html#cb429-18" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  6:        1 华北       &lt;NA&gt;            245</span></span>
<span id="cb429-19"><a href="datatable-advanced-functions.html#cb429-19" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  7:        0 华南       可比             86</span></span>
<span id="cb429-20"><a href="datatable-advanced-functions.html#cb429-20" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  8:        0 华南     不可比             79</span></span>
<span id="cb429-21"><a href="datatable-advanced-functions.html#cb429-21" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  9:        1 华南       &lt;NA&gt;            165</span></span>
<span id="cb429-22"><a href="datatable-advanced-functions.html#cb429-22" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 10:        0 华西       可比              2</span></span>
<span id="cb429-23"><a href="datatable-advanced-functions.html#cb429-23" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 11:        0 华西     不可比            198</span></span>
<span id="cb429-24"><a href="datatable-advanced-functions.html#cb429-24" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 12:        1 华西       &lt;NA&gt;            200</span></span>
<span id="cb429-25"><a href="datatable-advanced-functions.html#cb429-25" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 13:        3 &lt;NA&gt;       &lt;NA&gt;            928</span></span></code></pre></div>
<p>通过上述计算,发现计算结果与Excel透视表一样。</p>
<ul>
<li>cube</li>
</ul>
<p>观察<code>cube()</code>计算结果与<code>rollup()</code>差异，发现<code>cube()</code>聚合层次更多。</p>
<div class="sourceCode" id="cb430"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb430-1"><a href="datatable-advanced-functions.html#cb430-1" aria-hidden="true" tabindex="-1"></a><span class="fu">cube</span>(DT,<span class="at">j =</span> <span class="fu">sum</span>(value),<span class="at">by =</span> <span class="fu">c</span>(<span class="st">&quot;area&quot;</span>,<span class="st">&quot;store_type&quot;</span>),<span class="at">id =</span> <span class="cn">TRUE</span>)</span>
<span id="cb430-2"><a href="datatable-advanced-functions.html#cb430-2" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;     grouping area store_type  V1</span></span>
<span id="cb430-3"><a href="datatable-advanced-functions.html#cb430-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  1:        0 华东     不可比   9</span></span>
<span id="cb430-4"><a href="datatable-advanced-functions.html#cb430-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  2:        0 华东       可比 309</span></span>
<span id="cb430-5"><a href="datatable-advanced-functions.html#cb430-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  3:        0 华西       可比   2</span></span>
<span id="cb430-6"><a href="datatable-advanced-functions.html#cb430-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  4:        0 华西     不可比 198</span></span>
<span id="cb430-7"><a href="datatable-advanced-functions.html#cb430-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  5:        0 华南       可比  86</span></span>
<span id="cb430-8"><a href="datatable-advanced-functions.html#cb430-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  6:        0 华北     不可比  72</span></span>
<span id="cb430-9"><a href="datatable-advanced-functions.html#cb430-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  7:        0 华南     不可比  79</span></span>
<span id="cb430-10"><a href="datatable-advanced-functions.html#cb430-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  8:        0 华北       可比 173</span></span>
<span id="cb430-11"><a href="datatable-advanced-functions.html#cb430-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  9:        1 华东       &lt;NA&gt; 318</span></span>
<span id="cb430-12"><a href="datatable-advanced-functions.html#cb430-12" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 10:        1 华西       &lt;NA&gt; 200</span></span>
<span id="cb430-13"><a href="datatable-advanced-functions.html#cb430-13" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 11:        1 华南       &lt;NA&gt; 165</span></span>
<span id="cb430-14"><a href="datatable-advanced-functions.html#cb430-14" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 12:        1 华北       &lt;NA&gt; 245</span></span>
<span id="cb430-15"><a href="datatable-advanced-functions.html#cb430-15" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 13:        2 &lt;NA&gt;     不可比 358</span></span>
<span id="cb430-16"><a href="datatable-advanced-functions.html#cb430-16" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 14:        2 &lt;NA&gt;       可比 570</span></span>
<span id="cb430-17"><a href="datatable-advanced-functions.html#cb430-17" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 15:        3 &lt;NA&gt;       &lt;NA&gt; 928</span></span></code></pre></div>
<ul>
<li>groupingsets</li>
</ul>
<p>根据需要指定指定聚合的层次。</p>
<div class="sourceCode" id="cb431"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb431-1"><a href="datatable-advanced-functions.html#cb431-1" aria-hidden="true" tabindex="-1"></a><span class="co"># 与本例中rollup 结果一致</span></span>
<span id="cb431-2"><a href="datatable-advanced-functions.html#cb431-2" aria-hidden="true" tabindex="-1"></a><span class="fu">groupingsets</span>(DT,<span class="at">j =</span> <span class="fu">sum</span>(value),<span class="at">by =</span> <span class="fu">c</span>(<span class="st">&quot;area&quot;</span>,<span class="st">&quot;store_type&quot;</span>),<span class="at">sets =</span> <span class="fu">list</span>(<span class="st">&#39;area&#39;</span>,<span class="fu">c</span>(<span class="st">&quot;area&quot;</span>,<span class="st">&quot;store_type&quot;</span>), <span class="fu">character</span>()),<span class="at">id =</span> <span class="cn">TRUE</span>)</span>
<span id="cb431-3"><a href="datatable-advanced-functions.html#cb431-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;     grouping area store_type  V1</span></span>
<span id="cb431-4"><a href="datatable-advanced-functions.html#cb431-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  1:        1 华东       &lt;NA&gt; 318</span></span>
<span id="cb431-5"><a href="datatable-advanced-functions.html#cb431-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  2:        1 华西       &lt;NA&gt; 200</span></span>
<span id="cb431-6"><a href="datatable-advanced-functions.html#cb431-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  3:        1 华南       &lt;NA&gt; 165</span></span>
<span id="cb431-7"><a href="datatable-advanced-functions.html#cb431-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  4:        1 华北       &lt;NA&gt; 245</span></span>
<span id="cb431-8"><a href="datatable-advanced-functions.html#cb431-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  5:        0 华东     不可比   9</span></span>
<span id="cb431-9"><a href="datatable-advanced-functions.html#cb431-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  6:        0 华东       可比 309</span></span>
<span id="cb431-10"><a href="datatable-advanced-functions.html#cb431-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  7:        0 华西       可比   2</span></span>
<span id="cb431-11"><a href="datatable-advanced-functions.html#cb431-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  8:        0 华西     不可比 198</span></span>
<span id="cb431-12"><a href="datatable-advanced-functions.html#cb431-12" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  9:        0 华南       可比  86</span></span>
<span id="cb431-13"><a href="datatable-advanced-functions.html#cb431-13" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 10:        0 华北     不可比  72</span></span>
<span id="cb431-14"><a href="datatable-advanced-functions.html#cb431-14" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 11:        0 华南     不可比  79</span></span>
<span id="cb431-15"><a href="datatable-advanced-functions.html#cb431-15" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 12:        0 华北       可比 173</span></span>
<span id="cb431-16"><a href="datatable-advanced-functions.html#cb431-16" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 13:        3 &lt;NA&gt;       &lt;NA&gt; 928</span></span>
<span id="cb431-17"><a href="datatable-advanced-functions.html#cb431-17" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb431-18"><a href="datatable-advanced-functions.html#cb431-18" aria-hidden="true" tabindex="-1"></a><span class="co"># 与本例中cube 结果一致</span></span>
<span id="cb431-19"><a href="datatable-advanced-functions.html#cb431-19" aria-hidden="true" tabindex="-1"></a><span class="fu">groupingsets</span>(DT,<span class="at">j =</span> <span class="fu">sum</span>(value),<span class="at">by =</span> <span class="fu">c</span>(<span class="st">&quot;area&quot;</span>,<span class="st">&quot;store_type&quot;</span>),<span class="at">sets =</span> <span class="fu">list</span>(<span class="st">&#39;area&#39;</span>,<span class="fu">c</span>(<span class="st">&quot;area&quot;</span>,<span class="st">&quot;store_type&quot;</span>),<span class="st">&quot;store_type&quot;</span>, <span class="fu">character</span>()),<span class="at">id =</span> <span class="cn">TRUE</span>)</span>
<span id="cb431-20"><a href="datatable-advanced-functions.html#cb431-20" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;     grouping area store_type  V1</span></span>
<span id="cb431-21"><a href="datatable-advanced-functions.html#cb431-21" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  1:        1 华东       &lt;NA&gt; 318</span></span>
<span id="cb431-22"><a href="datatable-advanced-functions.html#cb431-22" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  2:        1 华西       &lt;NA&gt; 200</span></span>
<span id="cb431-23"><a href="datatable-advanced-functions.html#cb431-23" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  3:        1 华南       &lt;NA&gt; 165</span></span>
<span id="cb431-24"><a href="datatable-advanced-functions.html#cb431-24" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  4:        1 华北       &lt;NA&gt; 245</span></span>
<span id="cb431-25"><a href="datatable-advanced-functions.html#cb431-25" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  5:        0 华东     不可比   9</span></span>
<span id="cb431-26"><a href="datatable-advanced-functions.html#cb431-26" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  6:        0 华东       可比 309</span></span>
<span id="cb431-27"><a href="datatable-advanced-functions.html#cb431-27" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  7:        0 华西       可比   2</span></span>
<span id="cb431-28"><a href="datatable-advanced-functions.html#cb431-28" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  8:        0 华西     不可比 198</span></span>
<span id="cb431-29"><a href="datatable-advanced-functions.html#cb431-29" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  9:        0 华南       可比  86</span></span>
<span id="cb431-30"><a href="datatable-advanced-functions.html#cb431-30" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 10:        0 华北     不可比  72</span></span>
<span id="cb431-31"><a href="datatable-advanced-functions.html#cb431-31" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 11:        0 华南     不可比  79</span></span>
<span id="cb431-32"><a href="datatable-advanced-functions.html#cb431-32" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 12:        0 华北       可比 173</span></span>
<span id="cb431-33"><a href="datatable-advanced-functions.html#cb431-33" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 13:        2 &lt;NA&gt;     不可比 358</span></span>
<span id="cb431-34"><a href="datatable-advanced-functions.html#cb431-34" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 14:        2 &lt;NA&gt;       可比 570</span></span>
<span id="cb431-35"><a href="datatable-advanced-functions.html#cb431-35" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 15:        3 &lt;NA&gt;       &lt;NA&gt; 928</span></span></code></pre></div>
<blockquote>
<p>groupingsets: sets参数,用list()包裹想要聚合的字段组合,最后character(),加上该部分相当于不区分层级全部聚合,用法类似sql中“().”</p>
</blockquote>
<blockquote>
<p>SELECT brand, size, sum(sales) FROM items_sold GROUP BY GROUPING SETS ((brand), (size), ());</p>
</blockquote>
</div>
<div id="rleid" class="section level3" number="7.4.2">
<h3><span class="header-section-number">7.4.2</span> rleid</h3>
<p>该函数根据分组生成长度列。</p>
<p>即将0011001110111101类似这种分组成1 1 2 2 3 3 4 4 4 5 6 6 6 6 7 8。在特定时候是很便捷的一个函数。如在计算股票连续上涨或下跌天数时。</p>
<div class="sourceCode" id="cb432"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb432-1"><a href="datatable-advanced-functions.html#cb432-1" aria-hidden="true" tabindex="-1"></a><span class="fu">rleid</span>(<span class="fu">c</span>(<span class="dv">0</span>,<span class="dv">0</span>,<span class="dv">1</span>,<span class="dv">1</span>,<span class="dv">0</span>,<span class="dv">0</span>,<span class="dv">1</span>,<span class="dv">1</span>,<span class="dv">1</span>,<span class="dv">0</span>,<span class="dv">1</span>,<span class="dv">1</span>,<span class="dv">1</span>,<span class="dv">1</span>,<span class="dv">0</span>,<span class="dv">1</span>))</span>
<span id="cb432-2"><a href="datatable-advanced-functions.html#cb432-2" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  [1] 1 1 2 2 3 3 4 4 4 5 6 6 6 6 7 8</span></span></code></pre></div>
<p>用法：</p>
<div class="sourceCode" id="cb433"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb433-1"><a href="datatable-advanced-functions.html#cb433-1" aria-hidden="true" tabindex="-1"></a><span class="fu">rleid</span>(..., <span class="at">prefix=</span><span class="cn">NULL</span>)</span>
<span id="cb433-2"><a href="datatable-advanced-functions.html#cb433-2" aria-hidden="true" tabindex="-1"></a><span class="fu">rleidv</span>(x, <span class="at">cols=</span><span class="fu">seq_along</span>(x), <span class="at">prefix=</span><span class="cn">NULL</span>)</span></code></pre></div>
<div class="sourceCode" id="cb434"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb434-1"><a href="datatable-advanced-functions.html#cb434-1" aria-hidden="true" tabindex="-1"></a>DT <span class="ot">=</span> <span class="fu">data.table</span>(<span class="at">grp=</span><span class="fu">rep</span>(<span class="fu">c</span>(<span class="st">&quot;A&quot;</span>, <span class="st">&quot;B&quot;</span>, <span class="st">&quot;C&quot;</span>, <span class="st">&quot;A&quot;</span>, <span class="st">&quot;B&quot;</span>), <span class="fu">c</span>(<span class="dv">2</span>,<span class="dv">2</span>,<span class="dv">3</span>,<span class="dv">1</span>,<span class="dv">2</span>)), <span class="at">value=</span><span class="dv">1</span><span class="sc">:</span><span class="dv">10</span>)</span>
<span id="cb434-2"><a href="datatable-advanced-functions.html#cb434-2" aria-hidden="true" tabindex="-1"></a><span class="fu">rleid</span>(DT<span class="sc">$</span>grp) <span class="co"># get run-length ids</span></span>
<span id="cb434-3"><a href="datatable-advanced-functions.html#cb434-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  [1] 1 1 2 2 3 3 3 4 5 5</span></span>
<span id="cb434-4"><a href="datatable-advanced-functions.html#cb434-4" aria-hidden="true" tabindex="-1"></a><span class="fu">rleidv</span>(DT, <span class="st">&quot;grp&quot;</span>) <span class="co"># same as above</span></span>
<span id="cb434-5"><a href="datatable-advanced-functions.html#cb434-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  [1] 1 1 2 2 3 3 3 4 5 5</span></span>
<span id="cb434-6"><a href="datatable-advanced-functions.html#cb434-6" aria-hidden="true" tabindex="-1"></a><span class="fu">rleid</span>(DT<span class="sc">$</span>grp, <span class="at">prefix=</span><span class="st">&quot;grp&quot;</span>) <span class="co"># prefix with &#39;grp&#39;</span></span>
<span id="cb434-7"><a href="datatable-advanced-functions.html#cb434-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;  [1] &quot;grp1&quot; &quot;grp1&quot; &quot;grp2&quot; &quot;grp2&quot; &quot;grp3&quot; &quot;grp3&quot; &quot;grp3&quot; &quot;grp4&quot; &quot;grp5&quot; &quot;grp5&quot;</span></span></code></pre></div>
</div>
<div id="shift" class="section level3" number="7.4.3">
<h3><span class="header-section-number">7.4.3</span> shift</h3>
<p>向前或向后功能,通俗来说就是向前或向后移动位置。</p>
<p>示例如下：</p>
<div class="sourceCode" id="cb435"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb435-1"><a href="datatable-advanced-functions.html#cb435-1" aria-hidden="true" tabindex="-1"></a>x <span class="ot">=</span> <span class="dv">1</span><span class="sc">:</span><span class="dv">5</span></span>
<span id="cb435-2"><a href="datatable-advanced-functions.html#cb435-2" aria-hidden="true" tabindex="-1"></a><span class="co"># lag with n=1 and pad with NA (returns vector)</span></span>
<span id="cb435-3"><a href="datatable-advanced-functions.html#cb435-3" aria-hidden="true" tabindex="-1"></a><span class="fu">shift</span>(x, <span class="at">n=</span><span class="dv">1</span>, <span class="at">fill=</span><span class="cn">NA</span>, <span class="at">type=</span><span class="st">&quot;lag&quot;</span>)</span>
<span id="cb435-4"><a href="datatable-advanced-functions.html#cb435-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; [1] NA  1  2  3  4</span></span></code></pre></div>
<p>其中参数n控制偏移量，n正负数和type的参数相对应。, n=-1 and type=‘lead’ 与 n=1 and type=’lag’效果相同。</p>
<p>在data.table上使用：</p>
<div class="sourceCode" id="cb436"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb436-1"><a href="datatable-advanced-functions.html#cb436-1" aria-hidden="true" tabindex="-1"></a>DT <span class="ot">=</span> <span class="fu">data.table</span>(<span class="at">year=</span><span class="dv">2010</span><span class="sc">:</span><span class="dv">2014</span>, <span class="at">v1=</span><span class="fu">runif</span>(<span class="dv">5</span>), <span class="at">v2=</span><span class="dv">1</span><span class="sc">:</span><span class="dv">5</span>, <span class="at">v3=</span>letters[<span class="dv">1</span><span class="sc">:</span><span class="dv">5</span>])</span>
<span id="cb436-2"><a href="datatable-advanced-functions.html#cb436-2" aria-hidden="true" tabindex="-1"></a>cols <span class="ot">=</span> <span class="fu">c</span>(<span class="st">&quot;v1&quot;</span>,<span class="st">&quot;v2&quot;</span>,<span class="st">&quot;v3&quot;</span>)</span>
<span id="cb436-3"><a href="datatable-advanced-functions.html#cb436-3" aria-hidden="true" tabindex="-1"></a>anscols <span class="ot">=</span> <span class="fu">paste</span>(<span class="st">&quot;lead&quot;</span>, cols, <span class="at">sep=</span><span class="st">&quot;_&quot;</span>)</span>
<span id="cb436-4"><a href="datatable-advanced-functions.html#cb436-4" aria-hidden="true" tabindex="-1"></a>DT[, (anscols) <span class="sc">:</span><span class="er">=</span> <span class="fu">shift</span>(.SD, <span class="dv">1</span>, <span class="dv">0</span>, <span class="st">&quot;lead&quot;</span>), .SDcols<span class="ot">=</span>cols]</span></code></pre></div>
<p>例如求某人连续消费时间间隔天数时：</p>
<div class="sourceCode" id="cb437"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb437-1"><a href="datatable-advanced-functions.html#cb437-1" aria-hidden="true" tabindex="-1"></a>DT <span class="ot">=</span> <span class="fu">data.table</span>(<span class="at">dates =</span>lubridate<span class="sc">::</span><span class="fu">ymd</span>(<span class="fu">c</span>(<span class="dv">20210105</span>,<span class="dv">20210115</span>,<span class="dv">20210124</span>,<span class="dv">20210218</span>,<span class="dv">20210424</span>)))</span>
<span id="cb437-2"><a href="datatable-advanced-functions.html#cb437-2" aria-hidden="true" tabindex="-1"></a>DT[,newdate<span class="sc">:</span><span class="er">=</span><span class="fu">shift</span>(dates)]</span>
<span id="cb437-3"><a href="datatable-advanced-functions.html#cb437-3" aria-hidden="true" tabindex="-1"></a>DT</span>
<span id="cb437-4"><a href="datatable-advanced-functions.html#cb437-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;         dates    newdate</span></span>
<span id="cb437-5"><a href="datatable-advanced-functions.html#cb437-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 1: 2021-01-05       &lt;NA&gt;</span></span>
<span id="cb437-6"><a href="datatable-advanced-functions.html#cb437-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 2: 2021-01-15 2021-01-05</span></span>
<span id="cb437-7"><a href="datatable-advanced-functions.html#cb437-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 3: 2021-01-24 2021-01-15</span></span>
<span id="cb437-8"><a href="datatable-advanced-functions.html#cb437-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 4: 2021-02-18 2021-01-24</span></span>
<span id="cb437-9"><a href="datatable-advanced-functions.html#cb437-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 5: 2021-04-24 2021-02-18</span></span></code></pre></div>
<p>通过构造新列newdate，然后将两列相减<code>dates-newdate</code>即可得到每次购物间隔天数。</p>
</div>
<div id="j" class="section level3" number="7.4.4">
<h3><span class="header-section-number">7.4.4</span> J</h3>
<p>J 是<code>.()</code>,<code>list()</code>等的别名。<code>SJ</code>是排序连接，<code>CJ</code>是交叉连接。</p>
<p>用法：</p>
<div class="sourceCode" id="cb438"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb438-1"><a href="datatable-advanced-functions.html#cb438-1" aria-hidden="true" tabindex="-1"></a><span class="co"># DT[J(...)]                          # J() only for use inside DT[...]</span></span>
<span id="cb438-2"><a href="datatable-advanced-functions.html#cb438-2" aria-hidden="true" tabindex="-1"></a><span class="co"># DT[.(...)]                          # .() only for use inside DT[...]</span></span>
<span id="cb438-3"><a href="datatable-advanced-functions.html#cb438-3" aria-hidden="true" tabindex="-1"></a><span class="co"># DT[list(...)]                       # same; .(), list() and J() are identical</span></span>
<span id="cb438-4"><a href="datatable-advanced-functions.html#cb438-4" aria-hidden="true" tabindex="-1"></a><span class="fu">SJ</span>(...)                             <span class="co"># DT[SJ(...)]</span></span>
<span id="cb438-5"><a href="datatable-advanced-functions.html#cb438-5" aria-hidden="true" tabindex="-1"></a><span class="fu">CJ</span>(..., <span class="at">sorted=</span><span class="cn">TRUE</span>, <span class="at">unique=</span><span class="cn">FALSE</span>)  <span class="co"># DT[CJ(...)]</span></span></code></pre></div>
<ul>
<li>CJ</li>
</ul>
<p>我喜欢用<code>CJ()</code>函数创建笛卡尔积表。例如在商品运营中，时常需要将门店和商品形成笛卡尔积表，相比起<code>dplyr::full_join()</code> ,<code>data.table::merge.data.table(allow.cartesian = TRUE )</code>,<code>CJ</code>更加方便快捷。</p>
<div class="sourceCode" id="cb439"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb439-1"><a href="datatable-advanced-functions.html#cb439-1" aria-hidden="true" tabindex="-1"></a><span class="co"># CJ usage examples</span></span>
<span id="cb439-2"><a href="datatable-advanced-functions.html#cb439-2" aria-hidden="true" tabindex="-1"></a><span class="fu">CJ</span>(<span class="fu">c</span>(<span class="dv">5</span>, <span class="cn">NA</span>, <span class="dv">1</span>), <span class="fu">c</span>(<span class="dv">1</span>, <span class="dv">3</span>, <span class="dv">2</span>))                 <span class="co"># sorted and keyed data.table</span></span>
<span id="cb439-3"><a href="datatable-advanced-functions.html#cb439-3" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt;    V1 V2</span></span>
<span id="cb439-4"><a href="datatable-advanced-functions.html#cb439-4" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 1: NA  1</span></span>
<span id="cb439-5"><a href="datatable-advanced-functions.html#cb439-5" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 2: NA  2</span></span>
<span id="cb439-6"><a href="datatable-advanced-functions.html#cb439-6" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 3: NA  3</span></span>
<span id="cb439-7"><a href="datatable-advanced-functions.html#cb439-7" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 4:  1  1</span></span>
<span id="cb439-8"><a href="datatable-advanced-functions.html#cb439-8" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 5:  1  2</span></span>
<span id="cb439-9"><a href="datatable-advanced-functions.html#cb439-9" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 6:  1  3</span></span>
<span id="cb439-10"><a href="datatable-advanced-functions.html#cb439-10" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 7:  5  1</span></span>
<span id="cb439-11"><a href="datatable-advanced-functions.html#cb439-11" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 8:  5  2</span></span>
<span id="cb439-12"><a href="datatable-advanced-functions.html#cb439-12" aria-hidden="true" tabindex="-1"></a><span class="co">#&gt; 9:  5  3</span></span>
<span id="cb439-13"><a href="datatable-advanced-functions.html#cb439-13" aria-hidden="true" tabindex="-1"></a><span class="co"># do.call(CJ, list(c(5, NA, 1), c(1, 3, 2)))  # same as above</span></span>
<span id="cb439-14"><a href="datatable-advanced-functions.html#cb439-14" aria-hidden="true" tabindex="-1"></a><span class="co"># CJ(c(5, NA, 1), c(1, 3, 2), sorted=FALSE)   # same order as input, unkeyed</span></span></code></pre></div>
<ul>
<li>SJ</li>
</ul>
<p>SJ : Sorted Join. The same value as J() but additionally setkey() is called on all columns in the order they were passed to SJ. For efficiency, to invoke a binary merge rather than a repeated binary full search for each row of i.</p>
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